Inside the Consumer Price Index: March 2026

Inflation affects everyday costs—from grocery bills to rent—making the Consumer Price Index (CPI) one of the most closely watched economic indicators. At the household level, the CPI matters because it reflects how different categories of spending change in price over time and how much weight each category has in the overall index.

CPI structure and how weights are applied

The Bureau of Labor Statistics (BLS) divides consumer spending into eight broad categories and assigns each a relative size in the CPI-U (Consumer Price Index for Urban Consumers). The BLS updates these weights annually, with the latest weighting taking place in December 2025.

The categories are listed in the same order as the BLS tables rather than by their size in the index. The first three categories—food, shelter, and clothing—together account for over 60% of the index. Transportation comes before medical care, and recreation precedes the combined education and communication category. The “other goods and services” category is described as a mixed group that includes items such as tobacco, cosmetics, financial services, and funeral expenses.

Which CPI categories have risen the most since 2000

The CPI component growth discussion focuses on cumulative price changes for each of the eight categories since 2000.

Medical care and housing have been the fastest-growing categories, each increasing by more than 100% since the start of the century. Food and beverage is also up more than 100%, with the article attributing much of that rise to a steep spike in prices following the pandemic.

At the opposite end, apparel is described as nearly unchanged since 2000, with periods where it has even deflated. The article also highlights seasonal volatility in apparel prices.

Transportation is another category characterized by high volatility, described as more dramatic and irregular than apparel seasonality. Transportation includes a range of subcategories such as motor vehicles, fuel, parts and equipment, maintenance and repair, insurance, fees, and airline fares. The article says much of this volatility is driven by the motor fuel component, and it points to gasoline as a key factor.

Energy’s indirect role in the CPI

Unlike other spending categories, energy is not treated as a standalone expenditure category within the eight-category CPI framework. Instead, energy costs are distributed across housing and transportation expenses, and energy also shows up indirectly through changes in goods and services across the broader CPI.

The BLS does track energy as a separate aggregate index. It is comprised of household energy under “fuels and utilities” (within the housing category) and “motor fuels” (within the transportation category). As of the latest weighting in December 2025, energy has a relative importance of 6.297 out of 100—equivalent to about 6.3% of total expenditures.

Within that energy allocation, the article states that 2.9% goes to transportation fuels (mostly gasoline) and 3.4% goes to household energy (mostly electricity). The article notes that overlaying the energy aggregate on top of the eight expenditure categories shows energy’s impact on transportation.

College tuition and fees: a high-impact category for some households

The article describes college tuition as a major inflation concern for families paying for higher education. In the CPI weighting, “college tuition and fees” is assigned 1.351% of total expenditures.

For households with college-bound students, the article emphasizes that tuition and fees can strain budgets. It also notes that the education and communication category’s “college tuition and fees” subcategory is up nearly 200% since 2000. The article describes a steady “staircase” pattern that matches annual cost increases in late summer for each academic year.

It also cautions that the chart may overstate the impact because the BLS calculates tuition using sticker prices, which may not reflect what families actually pay after financial aid and grants. It points readers to College Board statistics for a more accurate view.

Daycare and preschool: rising faster than headline inflation

Early childhood care is described as an increasingly difficult financial hurdle. The BLS weights “daycare and preschool” at 0.699% of total expenditures, which the article says can dilute its visibility in headline inflation reports.

However, for households with young children, the article argues these costs are often a primary, non-negotiable expense that can rival or exceed monthly housing payments. It states that from roughly 2000 to the early 2020s, daycare costs tracked closely with high inflation in medical care, though consistently above.

The article says this pattern changed near the end of 2022, when daycare costs began to surge at an accelerated rate compared with the earlier trajectory. It attributes the shift to the expiration of pandemic-era stabilization grants and a tightening labor market. As of the article’s timeframe, daycare and preschool is up over 160% since 2000, moving from a steady climb to a steep ascent and increasing pressure on family budgets.

Headline CPI versus core CPI

Economists and policymakers—including the Federal Reserve—pay close attention to core inflation, defined as the overall inflation rate excluding food and energy.

The article notes a nuance: energy is an aggregate that combines transportation fuels and housing fuels (gas and electricity), while food is a major part of the food and beverage category. It also points out that alcoholic beverages remain included in core inflation calculations—so, while coffee is excluded under the food exclusion, the article says whiskey is not.

As of March 2026, the article reports that the annualized rate of change for headline CPI is 3.26%, while the annualized change for core CPI is 2.60%. It also reports cumulative changes since 2000 of 96.2% for headline CPI and 87.6% for core CPI.

The article adds that consumers often focus on the cumulative perspective because it can make the real impact on purchasing power over time easier to understand.

How inflation hits households differently

The article emphasizes that households experience inflation unevenly. For example, when gasoline prices rise sharply, a two-earner suburban family with long commutes can be affected more than a metro family with short subway commutes or remote workers with no commute.

It also notes that inflation can be more severe for low-income households, where grocery budgets shrink when gas prices rise. The article further states that energy costs are excluded from core inflation, and that households with high medical costs are more vulnerable than comparable households with lower medical expenses.

Overall, the article concludes that inflation volatility tends to hit hardest among lower-income households, those on fixed incomes, and families with high costs in tuition, daycare, transportation, or medical care—especially when there is little flexibility for discretionary spending.

Originally published on Advisor Perspectives.